6.60.12.1 Argument Types

The arguments to the built-in functions can be divided into three groups: register numbers, compile-time constants and run-time values. In order to make this classification clear at a glance, the arguments and return values are given the following pseudo types:

Pseudo type

Real C type

Constant?

Description

uh

unsigned short

No

an unsigned halfword

uw1

unsigned int

No

an unsigned word

sw1

int

No

a signed word

uw2

unsigned long long

No

an unsigned doubleword

sw2

long long

No

a signed doubleword

const

int

Yes

an integer constant

acc

int

Yes

an ACC register number

iacc

int

Yes

an IACC register number

These pseudo types are not defined by GCC, they are simply a notational convenience used in this manual.

Arguments of type uh, uw1, sw1, uw2 and sw2 are evaluated at run time. They correspond to register operands in the underlying FR-V instructions.

const arguments represent immediate operands in the underlying FR-V instructions. They must be compile-time constants.

acc arguments are evaluated at compile time and specify the number of an accumulator register. For example, an acc argument of 2 selects the ACC2 register.

iacc arguments are similar to acc arguments but specify the number of an IACC register. See see Other Built-in Functions for more details.